Krell Industries KAV 3250 Owner'S Reference Manual Download Page 1

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Instructions for Use

Owner’s Reference

THE LEADER IN AUDIO ENGINEERING

KAV–2250

Stereo Power Amplifier

KAV–3250

Three-channel Power Amplifier

Summary of Contents for KAV 3250

Page 1: ...Instructions for Use Owner s Reference THE LEADER IN AUDIO ENGINEERING KAV 2250 Stereo Power Amplifier KAV 3250 Three channel Power Amplifier ...

Page 2: ...splashing The ventilation grids on the top and bottom of the amplifier must be unobstructed at all times during operation Do not place flammable material above or beneath the amplifier Contact your authorized Krell dealer distributor or Krell before using any devices designed to alter or stabi lize the AC power for the KAV 2250 and the KAV 3250 Before connecting the KAV 2250 and the KAV 3250 make ...

Page 3: ... and Operation 13 Using a Dedicated Wall Switch 13 TROUBLESHOOTING SYSTEM NOISE 14 RECONFIGURATION OPTIONS FOR THE KAV 2250 AND KAV 3250 15 To Safely Access the Input Switch Banks 15 Amplifier Factory Default Settings 18 Reconfiguring the Amplifier for MAT Operation 18 Reconfiguring the Amplifier for Bridged Operation 21 Example of a Connection Scenario Multi power Mode 22 QUESTIONS AND ANSWERS 23...

Page 4: ...AV 2250 Back Panel 8 FIGURE 4 The KAV 3250 Back Panel 8 FIGURE 5 Amplifier Factory Default Settings 16 FIGURE 6 Reconfiguring the KAV 2250 for MAT Operation 17 FIGURE 7 Reconfiguring the KAV 3250 for MAT Operation 17 FIGURE 8 Reconfiguring the KAV 2250 for Bridged Operation 20 FIGURE 9 Reconfiguring the KAV 3250 for Bridged Operation 20 ...

Page 5: ...a wider range of power outputs and connection options Both the KAV 2250 and KAV 3250 amplifiers have balanced and single ended inputs for complete compatibility with other components The KAV 2250 and KAV 3250 amplifiers can be operated using the 12 VDC trigger on other components Either amplifier integrates seamlessly into home theater or whole house systems This reference manual contains importan...

Page 6: ...ring loudspeakers that have two sets of binding posts and independently powering multiple pairs of stereo loudspeakers to extend the listening environment throughout your home INPUT AND OUTPUT CONNECTIONS Balanced A symmetrical input or output circuit that has equal impedance from both input terminals to a common ground reference point The industry standard for professional and sound recording ins...

Page 7: ...r consumption status keeps the audio and regulator circuits at idle Krell recommends leaving the component in the stand by mode when it is not playing music Operational Mode From the stand by mode when the power button on the front panel is pressed and the blue power indicator illuminates the component is in the operational mode and ready to play music TECHNOLOGY Krell Current Mode A proprietary K...

Page 8: ...ands under cutouts and lift the amplifier straight out of the box 4 Place the amplifier in a safe location and remove the protective plastic wrapping Notes If any of these items are not included in the shipping box please contact your authorized Krell dealer distributor or Krell for assistance Save all packing materials If you ship your amplifier in the future repack the unit in its original packa...

Page 9: ...fications on pages 26 and 27 Place the amplifier as close to the loudspeakers as possible and keep the loudspeaker cable length to a minimum Loudspeaker cable adds impedance to the load the amplifier must drive regardless of the cable s gauge Krell amplifiers drive the lowest impedances with ease but long loudspeaker cables reduce the maximum power that is delivered to the loudspeakers AC POWER GU...

Page 10: ...KAV 2250 1 3 2 6 Krell KAV 2250 and KAV 3250 Figure 1 The KAV 2250 Front Panel Figure 2 The KAV 3250 Front Panel KAV 3250 1 3 2 1 Power Button 2 Stand by LED 3 Power Indicator ...

Page 11: ... Use this button to switch the power between the stand by and the operational modes and also to switch the 12 VDC output 12 V trigger on and off 2 Stand by LED The red stand by LED illuminates when the AC power cord is plugged into the wall and the back panel power switch is in the up on position 3 Power Indicator The blue power indicator illuminates when the amplifier is in the operational mode ...

Page 12: ...LL INDUSTRIES INC 45 CONNAIR ROAD ORANGE CT 06477 3650 USA MADE IN USA NO USER SERVICEABLE PARTS INSIDE 12VDC 30 mA max OUT 50 60 Hz IN AGC 12 AGC 12 INPUT 2 INPUT 1 OUTPUT 2 AGC 12 INPUT 3 OUTPUT 3 OUTPUT 1 BRIDGE 9 9 7 5 10 10 9 10 11 12 14 13 8 Krell KAV 2250 and KAV 3250 Balanced Inputs 4 Inputs 1 2 5 Inputs 1 3 Single Ended Inputs 6 Inputs 1 2 7 Inputs 1 3 Amplifier Channel Outputs 8 Outputs ...

Page 13: ...alanced XLR connectors Single ended Inputs 6 Inputs 1 2 The KAV 3250 has two channel inputs for output devices with single ended RCA connectors 7 Inputs 1 3 The KAV 3250 has three channel inputs for output devices with single ended RCA connectors Amplifier Channel Outputs 8 Outputs 1 2 The KAV 2250 has two amplifier channel outputs The loudspeaker binding post terminals accept spade lugs bare wire...

Page 14: ... components and other devices that incorporate a 12 V trigger This allows you to turn the amplifier on and off using a Krell or other component in a custom installation Notes When the component is in the operational mode the 12 VDC Out provides 12 V of DC output When the component is in the stand by mode or off the DC output is 0 V 12 VDC Out 12 V trigger current is limited to 30 mA Consult the ow...

Page 15: ...and 3 top are shorted together Remove the shorting pins to connect the amplifier for balanced operation The XLR pin configuration is described below Pin 1 Shield ground Pin 2 Non inverting hot 0 Pin 3 Inverting cold 180 Follow these steps to connect the amplifier to your system 1 Make sure all power sources and components are off before connecting inputs and outputs 2 Neatly organize the wiring be...

Page 16: ...e or pins Use the red terminal for the positive connection and the black terminal for the negative connection IMPORTANT Tighten loudspeaker binding posts by hand only 5 Plug the end of the AC power cord into the IEC power connector The amplifier is now ready for operation See Amplifier Operation on page 13 You can also reconfigure the amplifier for Multi Amp Throughput or bridged operation See Rec...

Page 17: ...l recommends leaving the amplifier in the stand by mode unless you will not be playing music for a long time IMPORTANT Always turn the amplifier off before changing input connections and mute or fully attenuate the preamplifier level when switching sources The amplifier has tremendous reserves of power and safely drives loudspeakers to extremely high sound pressure levels However use care when set...

Page 18: ...cables Turn the amplifier back on 3 If the hum reappears with the interconnect cable reinserted the cable may need to be replaced Turn the amplifier off and connect a different interconnect cable to the same location Turn the amplifier back on 4 If the hum disappears with the interconnect cable reinserted that cable most likely is sound 5 Turn the amplifier off disconnect the interconnect cable an...

Page 19: ...r and access the input switch banks IMPORTANT Removing the cover of the amplifier to reconfigure for MAT or for bridged operation is the ONLY instance you are authorized to remove the cover of ANY Krell component without voiding your Warranty For more information on product limitations and restrictions see Warranty on page 24 TO SAFELY ACCESS THE INPUT SWITCH BANKS Before reconfiguring the amplifi...

Page 20: ...it Board 3 1 2 O N 3 1 2 O N 3 1 2 O N 1 S4 S1 Bridge Channel 1 Input Channel 2 Input Channel 3 Input MT1 J7 J8 J9 S3 S2 Input Circuit Board KAV 2250 KAV 3250 1 2 O N Switch Up On Switch Down Off Bridge Switch Up On Bridge Switch Down Off 1 2 3 O N KAV 3250 Input Switch Bank KAV 2250 Input Switch Bank 16 Krell KAV 2250 and KAV 3250 ...

Page 21: ... 1 2 O N 3 1 2 O N 1 S4 S1 Bridge Channel 1 Input Channel 2 Input Channel 3 Input MT1 J7 J8 J9 S3 S2 Input Circuit Board 1 2 O N Switch Up On Switch Down Off Bridge Switch Up On Bridge Switch Down Off 1 2 3 O N KAV 3250 Input Switch Bank KAV 2250 Input Switch Bank Krell KAV 2250 and KAV 3250 17 Send One Input Signal to Both Output Channels via Input 1 Send One Input Signal to All Three Output Chan...

Page 22: ...aults 1 For input switch bank 1 switch 1 up on switch 2 down off 2 For input switch bank 2 switch 1 down off switch 2 up on The KAV 3250 amplifier is shipped with input switch banks set to the following factory defaults 1 For input switch bank 1 switch 1 up on other switches down off 2 For input switch bank 2 switch 2 up on other switches down off 3 For input switch bank 3 switch 3 up on other swi...

Page 23: ...ource device connected to input 1 1 Push switch 1 up on for all input switch banks 2 Push switches 2 and 3 down off for all input switch banks Reconfiguring the KAV 3250 for MAT Send One Input Signal to All Three Output Channels via Any Input Not illustrated You can send the signal from any of the inputs depending on your preference for example To send the signal from a source device connected to ...

Page 24: ...KAV 3250 for Bridged Operation Input Circuit Board 3 1 2 O N 3 1 2 O N 3 1 2 O N 1 S4 S1 Bridge Channel 1 Input Channel 2 Input Channel 3 Input MT1 J7 J8 J9 S3 S2 1 2 O N Switch Up On Switch Down Off Bridge Switch Up On Bridge Switch Down Off 1 2 3 O N KAV 3250 Input Switch Bank KAV 2250 Input Switch Bank 20 Krell KAV 2250 and KAV 3250 Bridge Channel 1 and 2 Bridge Channel 1 and 2 ...

Page 25: ... channels 1 and 2 bridged 1 For input switch bank 1 push switch 1 up on 2 For input switch bank 2 push switch 1 up on 3 Push the bridge switch up on between input switch banks 1 and 2 Notes Amplifier channels 1 and 2 may be bridged Channel 3 on the KAV 3250 cannot be bridged The unbridged channel on the KAV 3250 may be connected to a separate loudspeaker for normal operation Connecting the Amplifi...

Page 26: ... With multi power mode you can reconfigure the amplifier to independently power multiple pairs of stereo loudspeakers and extend the listening envi ronment throughout your home When the amplifier is reconfigured for MAT each channel powers an individual loudspeaker with one amplifier dedicated to driving outputs to the left loudspeakers and one amplifier driving outputs to the right loudspeakers T...

Page 27: ...ed Please contact your authorized Krell dealer distributor or Krell for suggestions Q When I connect the amplifier to my system using the single ended inputs a loud buzz comes from my loudspeakers What is it A Check that the shorting pins for the amplifier are inserted into the XLR inputs the unit is shipped with the pins in place When using the single ended inputs the shorting pins must be insert...

Page 28: ... U S A is included in the warranty If you have purchased your Krell product outside the U S A and wish to have it serviced at the factory all freight and associated charges to the factory are your responsibility Krell will pay return freight to the U S A based freight for warder of your choice Freight and other charges to ship the unit from the freight forwarder to you are also your respon sibilit...

Page 29: ...t may also be hand delivered if arrangements with the Service Department have been made in advance Proof of pur chase will be required for warranty valida tion at the time of hand delivery IMPORTANT Use the original packaging to ensure safe transit of this product to the dealer distribu tor or factory Krell may at its discretion return this product in new packaging and bill the owner for such pack...

Page 30: ... 8 Ohms 250 W 4 Ohms 500 W BRIDGED 8 Ohms 1000 W POWER Standby 35 W CONSUMPTION Idle 80 W Max 2000 W INPUTS 2 single ended via RCA connectors 2 balanced via XLR connectors OUTPUTS 2 amplifier channels via five way binding posts REMOTE CONNECTORS 12 VDC Out 12 V trigger via a 3 5 mm connector 12 VDC In 12 V trigger via a 3 5 mm connector DIMENSIONS 17 3w x 5 6h x 17 1d in 43 8w x 14 3h x 43 4d cm W...

Page 31: ...8 Ohms 250 W 4 Ohms 500 W BRIDGED 8 Ohms 1000 W POWER Standby 45 W CONSUMPTION Idle 115 W Max 2000 W INPUTS 3 single ended via RCA connectors 3 balanced via XLR connectors OUTPUTS 3 amplifier channels via five way binding posts REMOTE CONNECTORS 12 VDC Out 12 V trigger via a 3 5 mm connector 12 VDC In 12 V trigger via a 3 5 mm connector DIMENSIONS 17 3w x 5 6h x 17 1d in 43 8w x 14 3h x 43 4d cm W...

Page 32: ...ower Amplifier KAV 3250 Three channel Power Amplifier v 01 2 Krell Industries Inc 45 Connair Road Orange CT 06477 3650 USA TEL 203 799 9954 FAX 203 891 2028 E MAIL krell krellonline com WEBSITE http www krellonline com ...

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